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The spring behind the pilot fuel-mixture screw keeps tension on its adjustment. Keihin 1290-812-2001 is listed for FCR-MX37, FCR-MX39 and FCR-MX41 carburetors and belongs to the pilot screw assembly, rather than the throttle return mechanism.
Keihin part number 1290-812-2001. Order number 021-041. Match the spring to your pilot screw assembly.
- FCR-MX exploded view reference: 33.
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